Last active
April 18, 2022 06:21
-
-
Save amg1127/c82cf89d51433c8ba00deafee6bff37c to your computer and use it in GitHub Desktop.
Modify DNS records with idempotence
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function Adjust-DNSServerResourceRecord { | |
param( | |
[Parameter(Mandatory=$true)][string]$ZoneName, | |
[Parameter(Mandatory=$true)][string]$Name, | |
[Parameter(Mandatory=$true)][string]$RRType, | |
[Parameter(Mandatory=$true)]$Data, | |
$TimeToLive = $null | |
) | |
# Initialize local variables | |
$dnsRecordTypesRetrieval = @{ | |
'CNAME' = 'HostNameAlias'; | |
'A' = @('IPv4Address', 'IPAddressToString') | |
} | |
$dnsRecordTypesCreation = @{ | |
'CNAME' = @{ | |
"CName" = $true; | |
"HostNameAlias" = $null | |
}; | |
'A' = @{ | |
"A" = $true; | |
"IPv4Address" = $null | |
} | |
} | |
$dnsRecordTypesCreationKeys = @{ | |
'CNAME' = 'HostNameAlias'; | |
'A' = 'IPv4Address' | |
} | |
# Find the DNS server address and the default RR TTL | |
$dnsSOARecords = @(Resolve-DnsName -Type SOA -Name $ZoneName) | |
$dnsServer = $dnsSOARecords[0].PrimaryServer | |
$dnsTTL = $dnsSOARecords[0].DefaultTTL | |
# Validate function arguments | |
if (-not ($dnsRecordTypesRetrieval.ContainsKey($RRType))) { | |
throw ("Invalid RRtype: '" + $RRType + "'") | |
} | |
if (-not $TimeToLive) { | |
$TimeToLive = New-TimeSpan -Seconds $dnsTTL | |
} | |
# Check whether or not DNS records need update | |
try { | |
$dnsRecords = Get-DnsServerResourceRecord ` | |
-ComputerName $dnsServer ` | |
-ZoneName $ZoneName ` | |
-Name $Name ` | |
-RRType $RRType ` | |
-Node | |
if ((@($dnsRecords) | Where-Object { $_.TimeToLive -ne $TimeToLive }).length -eq 0) { | |
$dnsRecords = $dnsRecords | Select -ExpandProperty RecordData | |
foreach ($property in @($dnsRecordTypesRetrieval[$RRType])) { | |
$dnsRecords = $dnsRecords | Select-Object -ExpandProperty $property | |
} | |
if ($dnsRecords) { | |
if (-not (Compare-Object -ReferenceObject $dnsRecords -DifferenceObject $Data)) { | |
return | |
} | |
} | |
} | |
} finally { | |
} | |
# DNS records do need update. Delete old records... | |
try { | |
Get-DnsServerResourceRecord ` | |
-ComputerName $dnsServer ` | |
-ZoneName $ZoneName ` | |
-Name $Name ` | |
-Node | ` | |
Select -Unique -ExpandProperty RecordType | ForEach-Object { | |
try { | |
Remove-DnsServerResourceRecord ` | |
-ComputerName $dnsServer ` | |
-ZoneName $ZoneName ` | |
-Name $Name ` | |
-RRType $_ ` | |
-Force | |
Write-Warning ("Removed '" + $Name + "." + $ZoneName + " " + $_ + "'...") | |
} catch { | |
Write-Error $_ | |
} | |
} | |
} finally { | |
} | |
# ...and create new ones. | |
foreach ($item in @($Data)) { | |
$params = $dnsRecordTypesCreation[$RRType] | |
$params[$dnsRecordTypesCreationKeys[$RRType]] = $item | |
try { | |
$newDNSRecord = Add-DnsServerResourceRecord ` | |
-ComputerName $dnsServer ` | |
-ZoneName $ZoneName ` | |
-Name $Name ` | |
@params ` | |
-TimeToLive $TimeToLive ` | |
-PassThru | |
Write-Warning ("Added '" + $Name + "." + $ZoneName + " " + $newDNSRecord.TimeToLive.TotalSeconds + " " + $RRType + " " + $item + "'...") | |
} catch { | |
Write-Error $_ | |
} | |
} | |
} | |
Adjust-DNSServerResourceRecord -ZoneName adatum.com -Name test -RRType A -Data 172.16.1.245,172.24.0.1 | |
Adjust-DNSServerResourceRecord -ZoneName adatum.com -Name testalias -RRType CNAME -Data test.adatum.com. -TimeToLive 0:2:0 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment